div{
  position: relative;
  margin: 0px;
  padding: 0px;
}
#headImg{
  width: 50px;
  height: 50px;
  border-radius: 25px;
}
.slider{
  width: 100%;
  height: 400px;
}
#slider_box{
  box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.3);
}
.money{
  color: #FF5722;
  position: absolute; 
  right: 10px;
}
.time{
  position: relative; 
  left: 20px;
}
.movie_name{
  position: relative;
  left: 5px;
}
.movie_teacher_headImg{
  width: 30px;height: 30px; border-radius: 15px;
}
.movie_box{
  height: 240px; 
  box-shadow: 0px 0px 3px 0px rgba(0, 0, 0, 0.3);
}
#logo{
  top: 20px;
  left: 10px;
}
#search{
  width: 240px;
  height: 25px;
  position: relative;
  top: 28px;
  left: 50px;
}
#nav_bar{
  background-color: rgba(0, 0, 0, 0);
  color: #009688;
  top: -400px;
}
.play_img{
  width: 50px;
  height: 50px;
  border-radius: 25px;
  opacity: 0.5;
}
.play_div{
  top: -120px;
  left: 120px;
}
.info{
  top: -50px;
}

/* 菜单 */
*{
  margin:0;
  padding:0;
}
#leftMenu a{
  color: white;
  text-decoration-line: none;
}
#leftMenu ul{
  color: white;
  width:200px;
  position:absolute;
  background: rgba(0, 0, 0, 0.2);
  list-style:none;
  border-radius: 5px;
}
#leftMenu li{
  width:200px;
  position: relative;
  padding: 10px 0px;
}
#leftMenu li>ul{
  left: 200px;
  top: 0;
  display: none;
}
#leftMenu li:hover>ul{
  display: block;
}
.firstLi{
  width: 200px;
}